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Note Related party transactions (Proportionate share of income (loss) from PRLP 2011 Holdings, LLC minority interest) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |
Income Loss From Equity Method Investments | $ 38,000 | $ 34,100 |
PRLP 2011 Holding, LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Income Loss From Equity Method Investments | $ (356) | $ (972) | $ (502)

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